EpetraExt_BlockCrsMatrix.h

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/*
************************************************************************

              EpetraExt: Extended Linear Algebra Services Package 
                Copyright (2001) Sandia Corporation

Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
license for use of this work by or on behalf of the U.S. Government.

This library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
 
This library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.
 
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA
Questions? Contact Michael A. Heroux (maherou@sandia.gov) 

************************************************************************
*/
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#ifndef EPETRAEXT_BLOCKCRSMATRIX_H
#define EPETRAEXT_BLOCKCRSMATRIX_H

#include <vector>

#include "Epetra_CrsMatrix.h" 


namespace EpetraExt {

class BlockCrsMatrix: public Epetra_CrsMatrix {
 public:



  BlockCrsMatrix( const Epetra_CrsGraph & BaseGraph, const std::vector<int> & RowStencil, int RowIndex, const Epetra_Comm & GlobalComm );
  

  BlockCrsMatrix( const Epetra_CrsGraph & BaseGraph, const std::vector< std::vector<int> > & RowStencil, const std::vector<int> & RowIndices, const Epetra_Comm & GlobalComm );

  BlockCrsMatrix( const Epetra_RowMatrix & BaseMatrix, const std::vector< std::vector<int> > & RowStencil, const std::vector<int> & RowIndices, const Epetra_Comm & GlobalComm );
  
  BlockCrsMatrix( const BlockCrsMatrix & Matrix );

  virtual ~BlockCrsMatrix();
  
  const std::vector<int> & Stencil( int i = 0 ) { return RowStencil_[i]; }

  int RowIndex( int i = 0 ) { return RowIndices_[i]; }
  
  void LoadBlock(const Epetra_RowMatrix & BaseMatrix, const int Row, const int Col);

  void SumIntoBlock(double alpha, const Epetra_RowMatrix & BaseMatrix, const int Row, const int Col);

  void BlockSumIntoGlobalValues(const int BaseRow, int NumIndices,
     double* Values, const int* Indices, const int Row, const int Col);
  void BlockReplaceGlobalValues(const int BaseRow, int NumIndices,
     double* Values, const int* Indices, const int Row, const int Col);
  void BlockExtractGlobalRowView(const int BaseRow, int& NumEntries, 
     double*& Values, const int Row, const int Col);

  void ExtractBlock(Epetra_CrsMatrix & BaseMatrix, const int Row, const int Col);

 protected:

  Epetra_CrsGraph BaseGraph_;

  std::vector< std::vector<int> > RowStencil_;

  std::vector<int> RowIndices_; 

  int Offset_;

};

} //namespace EpetraExt

#endif /* EPETRA_CRSMATRIX_H */